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压水堆一回路反冲质子反应源项GEANT4模拟
Simulation study on source terms generated by recoil protons of the primary loop of pressurized water reactor
- 核技术 2018年41卷第4期 文章编号：040604
- 作者机构：
中国核动力研究设计院 核反应堆系统设计技术重点实验室 成都 610023
- 作者简介：
[ "刘斌, 男, 1987年出生, 2015年于西安交通大学获博士学位, 主要研究领域为核反应堆屏蔽以及源项计算", "LIU Bin, male, born in 1987, graduated from Xi'an Jiaotong University with a doctoral degree in 2015, focusing on computation of nuclear shielding and source terms" ]
- 基金信息：
DOI：10.11889/j.0253-3219.2018.hjs.41.040604
中图分类号： TL328收稿日期：2017-06-01，
修回日期：2017-09-26，
纸质出版日期：2018-04-10
- 稿件说明：
移动端阅览
刘斌, 李兰, 吕焕文, 等. 压水堆一回路反冲质子反应源项GEANT4模拟[J]. 核技术, 2018,41(4):040604
Bin LIU, Lan LI, Huanwen LYU, et al. Simulation study on source terms generated by recoil protons of the primary loop of pressurized water reactor[J]. Nuclear techniques, 2018, 41(4): 040604
刘斌, 李兰, 吕焕文, 等. 压水堆一回路反冲质子反应源项GEANT4模拟[J]. 核技术, 2018,41(4):040604 DOI： 10.11889/j.0253-3219.2018.hjs.41.040604.
Bin LIU, Lan LI, Huanwen LYU, et al. Simulation study on source terms generated by recoil protons of the primary loop of pressurized water reactor[J]. Nuclear techniques, 2018, 41(4): 040604 DOI： 10.11889/j.0253-3219.2018.hjs.41.040604.
摘要
在核反应堆一回路系统中，裂变中子产生的反冲质子通过电离、多次散射以及韧致辐射后，与冷却剂中的
16
O、
18
O和
11
B反应生成具有β
+
放射性的
13
N、
18
F和
11
C等核素，采用符合测量方法可以探测这些核素从而推断一回路水的泄漏情况。采用GEANT4程序对秦山二期压水堆全堆芯进行建模及源抽样描述，编制C++工具自动生成GEANT4计算所需的中子源分布，实现了G4-NONU功能以及GEANT4程序中中子固定源的输运计算。充分考虑反冲质子电离、多次散射以及韧致辐射等因素，计算了压水堆一回路水中由质子反应产生的
13
N、
18
F以及
11
C等核素的产生率、浓度以及活度，拓展了反应堆源项计算工具。
Abstract
Background
2
In reactor core
recoil protons produced by fission neutrons may interact with coolant of the primary circuit and produce radioactive nuclides through reactions
16
O(p
α)
13
N
18
O(p
n)
18
F and
11
B(p
n)
11
C. Positrons emitted by the radioactive nuclides
13
N
18
F and
11
C
etc.
can be detected by coincidence measurement
hence the leakage of the reactor coolant inferred. However
calculation of the source terms of the nuclear reactor core are mainly based on solving the point burn-up equation or simulation of the reactivity based on Monte Carlo method
lacking the capability to simulate (p
α) and (p
n) reactions for protons at 0~20 MeV.
Purpose
2
This study aims to simulate the production of source terms generated by protons for the reactors of Qinshan's second nuclear plant.
Methods
2
Full reactor core of the reactor was modeled in GEANT4. Source sampling description based on general particle source (GPS) was achieved in consideration of radial and axial power distributions of the reactor core. G4-NONU was developed using C++ for neutron transportation to realize the function of NONU card in MCNP (Monte Carlo N Particle Transport Code) by modifying the fission model in GEANT4. Energy spectrum of recoil protons in water of the primary circuit was calculated
so were the reactivities of
16
O(p
α)
13
N
18
O(p
n)
18
F and
11
B(p
n)
11
C. Eventually
concentrations and activities of
13
N
18
F and
11
C of the primary circuit were computed.
Results and Conclusion
2
Methods for description of source terms for pressurized water reactor in GEANT4 were established and nuclear reactor problems involving charged particles can be simulated by self developed G4-NONU
which is an enrichment of the simulations tool for nuclear reactor.
关键词
Keywords
references
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